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I have a 2008 Yukon Denali. There is no power getting to the blower motor. I have tested the fuses and relays, replaced the blower resistor, and straight powered the fan/blower motor with 12V power and the motor ran. The rear CC works fine but nothing is working in the front. Please help

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1 Answer

Need wiring diagrams in order to learn what is in the
circuit & how it works & were to do your testing

I think most people know that, but have no experience
working with wiring diagrams

I won't go near a vehicle or check anything at all, without
studying a wiring diagram first

You did the component testing part, but you usually do the
power or voltage drop testing & grounds to components first

Posted on May 10, 2014

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Posted on Jan 02, 2017

ginko
  • 19396 Answers

SOURCE: Blower Motor on 2000 Saturn SL

The blower motor is connected to a termic switch, when the motor is fine and fuse is ok, is the switch that must be replaced.

Ensure the fuse is ok first.

Posted on Oct 02, 2008

  • 6 Answers

SOURCE: 2004 Yukon Denali

This is from the A/C Module located under the dash passenger side, check wether the internal fan is working if it is, then change the Module which is a small black part with two white metal blades like... and your A/C should work again...

Aymen

Posted on Mar 21, 2009

Molson02536
  • 3854 Answers

SOURCE: 1999 yukon denali blower motor not working

Check the dash fan control switch. It can be purchased separate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unscrew the heater fan control from the back. Auto Zone may have this part and have the step by step instruction to get the job done if needed. Good luck and hope this helps, if the fuse and relay is good, then it's going to be the switch. Keep me posted, be glad to help. 

Posted on Jun 27, 2009

carfreak1217
  • 109 Answers

SOURCE: 1999 yukon denali front blower motor not working

Check Fuse #3 in the under hood fuse block it is the only common connection I can make.

Posted on Jun 28, 2009

reisdos
  • 1297 Answers

SOURCE: 1997 Oldsmobile eighty-eight blower fan not working

blower motor resistor

Posted on Jun 07, 2010

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2008 GMC Yukon denali front heater fan won't come on checked fuses all look good rear fan works need help thanks. It's cold in ND this time of year supposed to get below zero later this weekend


If your fan works on high only, you may had a bad blower motor resistor. But if it doesn't work at all and the fuse is good, I would start by checking the fan itself. If you have or can get a 12volt test light (at local parts store), you can access the 2 wires that lead into fan and check for power and ground. Your fan is located on the passenger side behind the glove. Since you have a GM, you should have a cover that can be removed towards the very bottom. Remove cover and bottom of fan should be exposed. Clip the alligator side of test light to a good ground, then probe the 2 wires at bottom of fan. One wire should light up if you have power going to fan. If it does, you have a bad fan motor. Hope this helps you. Good luck.

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1 Answer

GMC 2004 Envoy blows heat even with blower off ... Why ?


The relay in your blower motor is stuck on, there is a TSB for this issue. Replace the blower motor resistor and you'll be back in business.
How does the resistor get power if the fuse is pulled?
Replacing the resistor will cure both problems. TSB is a technical service bullitin seen below
Subject:HVAC Blower Motor May Run Continuously After Vehicle is Turned Off (Replace Blower Resistor Relay)Models:2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT2004 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon XLwith Manual Control HVAC (RPO CJ3)Built Prior to August, 2003

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Installed new blower motor. bearing shelled in old one. new motor won't blow. tested . it's good don't have power to moter. fuses good relay good. isthere a circuit breaker in wiring for b


I don't have a diagram for a 2008. On 2005 models the blower motor relay gets power from a 30amp fuse.
When the blower switch is in the high position the resistor is bypassed and power flows directly to the motor. The motor is grounded to the car.
The fan relay also gets power from a 7.5amp fuse and is controlled by the HVAC control on the dash.
Do you have power into and out of the relay?

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Does it work on any speeds? If it still works on high then the blower resistor is bad. On the passenger side under the glovebox is the blower motor and resistor.If possible try wiggling the pigtail plugs that attach to these two components.It is not uncommon to have problems with these pigtails.Also try tapping the bottom of the blower motor to see if it will start working again.If it does The connections are poor and need repaired. If the blower will not work at all check for power at the blower motor pigtail with a test light or dvm. Will be glad to assist further if more assistance is needed.

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1 Answer

2003 yukon denali---relay locate for blower


the relay is built into the speed resistor or motor control module ) depends if you have automative or manual heater controls. is automatic it will be motor control module and manual is the resistor module. these units are located beside the heate fan motor. the motor helps keeps the unit cool. just unbolt the module, unplug it and install new one. Just check to make sure the connector is good.. The heat created by the connection sometimes melts the power or ground leads (red or black) and if this is so you will need to replace the pin.

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check fuse,blower motor relay and blower resister(mounted in blower box) and blower motor

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1 Answer

1999 yukon denali front blower motor not working


Check Fuse #3 in the under hood fuse block it is the only common connection I can make.

Jun 28, 2009 | 1999 GMC Yukon Denali

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